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@ -1,22 +1,30 @@
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//! Run an XMR/BTC swap in the role of Alice.
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//! Alice holds XMR and wishes receive BTC.
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use anyhow::Result;
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use async_trait::async_trait;
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use backoff::{backoff::Constant as ConstantBackoff, future::FutureOperation as _};
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use genawaiter::GeneratorState;
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use libp2p::{
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core::{identity::Keypair, Multiaddr},
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request_response::ResponseChannel,
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NetworkBehaviour, PeerId,
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};
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use rand::rngs::OsRng;
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use std::thread;
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use tracing::{debug, info};
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use std::{sync::Arc, time::Duration};
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use tokio::sync::Mutex;
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use tracing::{debug, info, warn};
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mod amounts;
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mod message0;
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mod message1;
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mod message2;
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mod message3;
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use self::{amounts::*, message0::*, message1::*, message2::*};
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use self::{amounts::*, message0::*, message1::*, message2::*, message3::*};
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use crate::{
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bitcoin,
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bitcoin::TX_LOCK_MINE_TIMEOUT,
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monero,
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network::{
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peer_tracker::{self, PeerTracker},
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request_response::AliceToBob,
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@ -24,32 +32,111 @@ use crate::{
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},
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SwapAmounts, PUNISH_TIMELOCK, REFUND_TIMELOCK,
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};
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use xmr_btc::{alice::State0, bob, monero};
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pub type Swarm = libp2p::Swarm<Alice>;
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use xmr_btc::{
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alice::{self, action_generator, Action, ReceiveBitcoinRedeemEncsig, State0},
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bitcoin::BroadcastSignedTransaction,
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bob,
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monero::{CreateWalletForOutput, Transfer},
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};
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pub async fn swap(
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bitcoin_wallet: Arc<bitcoin::Wallet>,
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monero_wallet: Arc<monero::Wallet>,
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listen: Multiaddr,
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local_port: Option<u16>,
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redeem_address: ::bitcoin::Address,
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punish_address: ::bitcoin::Address,
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) -> Result<()> {
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struct Network {
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swarm: Arc<Mutex<Swarm>>,
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channel: Option<ResponseChannel<AliceToBob>>,
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}
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impl Network {
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pub async fn send_message2(&mut self, proof: monero::TransferProof) {
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match self.channel.take() {
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None => warn!("Channel not found, did you call this twice?"),
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Some(channel) => {
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let mut guard = self.swarm.lock().await;
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guard.send_message2(channel, alice::Message2 {
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tx_lock_proof: proof,
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});
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info!("Sent transfer proof");
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}
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}
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}
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}
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// TODO: For retry, use `backoff::ExponentialBackoff` in production as opposed
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// to `ConstantBackoff`.
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#[async_trait]
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impl ReceiveBitcoinRedeemEncsig for Network {
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async fn receive_bitcoin_redeem_encsig(&mut self) -> xmr_btc::bitcoin::EncryptedSignature {
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#[derive(Debug)]
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struct UnexpectedMessage;
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let encsig = (|| async {
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let mut guard = self.swarm.lock().await;
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let encsig = match guard.next().await {
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OutEvent::Message3(msg) => msg.tx_redeem_encsig,
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other => {
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warn!("Expected Bob's Bitcoin redeem encsig, got: {:?}", other);
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return Err(backoff::Error::Transient(UnexpectedMessage));
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}
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};
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Result::<_, backoff::Error<UnexpectedMessage>>::Ok(encsig)
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})
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.retry(ConstantBackoff::new(Duration::from_secs(1)))
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.await
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.expect("transient errors to be retried");
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info!("Received Bitcoin redeem encsig");
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encsig
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}
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}
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let mut swarm = new_swarm(listen, local_port)?;
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let message0: bob::Message0;
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let mut state0: Option<alice::State0> = None;
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let mut last_amounts: Option<SwapAmounts> = None;
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// TODO: This loop is a neat idea for local development, as it allows us to keep
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// Alice up and let Bob keep trying to connect, request amounts and/or send the
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// first message of the handshake, but it comes at the cost of needing to handle
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// mutable state, which has already been the source of a bug at one point. This
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// is an obvious candidate for refactoring
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loop {
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match swarm.next().await {
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OutEvent::ConnectionEstablished(id) => {
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info!("Connection established with: {}", id);
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OutEvent::ConnectionEstablished(bob) => {
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info!("Connection established with: {}", bob);
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}
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OutEvent::Request(amounts::OutEvent::Btc { btc, channel }) => {
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debug!("Got request from Bob to swap {}", btc);
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let amounts = calculate_amounts(btc);
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// TODO: We cache the last amounts returned, this needs improving along with
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// verification of message 0.
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last_amounts = Some(amounts);
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swarm.send_amounts(channel, amounts);
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let SwapAmounts { btc, xmr } = amounts;
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let redeem_address = bitcoin_wallet.as_ref().new_address().await?;
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let punish_address = redeem_address.clone();
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// TODO: Pass this in using <R: RngCore + CryptoRng>
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let rng = &mut OsRng;
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let state = State0::new(
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rng,
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btc,
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xmr,
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REFUND_TIMELOCK,
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PUNISH_TIMELOCK,
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redeem_address,
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punish_address,
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);
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info!("Commencing handshake");
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swarm.set_state0(state.clone());
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state0 = Some(state)
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}
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OutEvent::Message0(msg) => {
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// We don't want Bob to be able to crash us by sending an out of
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@ -64,26 +151,7 @@ pub async fn swap(
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};
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}
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let (xmr, btc) = match last_amounts {
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Some(p) => (p.xmr, p.btc),
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None => unreachable!("should have amounts by here"),
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};
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// TODO: Pass this in using <R: RngCore + CryptoRng>
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let rng = &mut OsRng;
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let state0 = State0::new(
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rng,
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btc,
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xmr,
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REFUND_TIMELOCK,
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PUNISH_TIMELOCK,
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redeem_address,
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punish_address,
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);
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swarm.set_state0(state0.clone());
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// TODO: Can we verify message 0 before calling this so we never fail?
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let state1 = state0.receive(message0).expect("failed to receive msg 0");
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let state1 = state0.expect("to be set").receive(message0)?;
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let (state2, channel) = match swarm.next().await {
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OutEvent::Message1 { msg, channel } => {
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@ -96,17 +164,72 @@ pub async fn swap(
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let msg = state2.next_message();
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swarm.send_message1(channel, msg);
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let _state3 = match swarm.next().await {
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OutEvent::Message2(msg) => state2.receive(msg)?,
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let (state3, channel) = match swarm.next().await {
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OutEvent::Message2 { msg, channel } => {
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let state3 = state2.receive(msg)?;
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(state3, channel)
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}
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other => panic!("Unexpected event: {:?}", other),
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};
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info!("Handshake complete, we now have State3 for Alice.");
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thread::park();
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Ok(())
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let network = Arc::new(Mutex::new(Network {
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swarm: Arc::new(Mutex::new(swarm)),
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channel: Some(channel),
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}));
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let mut action_generator = action_generator(
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network.clone(),
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bitcoin_wallet.clone(),
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state3,
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TX_LOCK_MINE_TIMEOUT,
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);
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loop {
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let state = action_generator.async_resume().await;
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tracing::info!("Resumed execution of generator, got: {:?}", state);
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match state {
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GeneratorState::Yielded(Action::LockXmr {
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amount,
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public_spend_key,
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public_view_key,
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}) => {
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let (transfer_proof, _) = monero_wallet
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.transfer(public_spend_key, public_view_key, amount)
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.await?;
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let mut guard = network.as_ref().lock().await;
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guard.send_message2(transfer_proof).await;
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info!("Sent transfer proof");
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}
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GeneratorState::Yielded(Action::RedeemBtc(tx)) => {
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let _ = bitcoin_wallet.broadcast_signed_transaction(tx).await?;
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}
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GeneratorState::Yielded(Action::CancelBtc(tx)) => {
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let _ = bitcoin_wallet.broadcast_signed_transaction(tx).await?;
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}
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GeneratorState::Yielded(Action::PunishBtc(tx)) => {
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let _ = bitcoin_wallet.broadcast_signed_transaction(tx).await?;
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}
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GeneratorState::Yielded(Action::CreateMoneroWalletForOutput {
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spend_key,
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view_key,
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}) => {
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monero_wallet
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.create_and_load_wallet_for_output(spend_key, view_key)
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.await?;
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}
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GeneratorState::Complete(()) => return Ok(()),
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}
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}
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}
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pub type Swarm = libp2p::Swarm<Alice>;
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fn new_swarm(listen: Multiaddr, port: Option<u16>) -> Result<Swarm> {
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use anyhow::Context as _;
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@ -155,7 +278,11 @@ pub enum OutEvent {
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msg: bob::Message1,
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channel: ResponseChannel<AliceToBob>,
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},
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Message2(bob::Message2),
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Message2 {
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msg: bob::Message2,
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channel: ResponseChannel<AliceToBob>,
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},
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Message3(bob::Message3),
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}
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impl From<peer_tracker::OutEvent> for OutEvent {
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@ -193,7 +320,15 @@ impl From<message1::OutEvent> for OutEvent {
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impl From<message2::OutEvent> for OutEvent {
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fn from(event: message2::OutEvent) -> Self {
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match event {
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message2::OutEvent::Msg(msg) => OutEvent::Message2(msg),
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message2::OutEvent::Msg { msg, channel } => OutEvent::Message2 { msg, channel },
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}
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}
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}
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impl From<message3::OutEvent> for OutEvent {
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fn from(event: message3::OutEvent) -> Self {
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match event {
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message3::OutEvent::Msg(msg) => OutEvent::Message3(msg),
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}
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}
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}
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@ -208,6 +343,7 @@ pub struct Alice {
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message0: Message0,
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message1: Message1,
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message2: Message2,
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message3: Message3,
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#[behaviour(ignore)]
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identity: Keypair,
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}
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@ -225,10 +361,12 @@ impl Alice {
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pub fn send_amounts(&mut self, channel: ResponseChannel<AliceToBob>, amounts: SwapAmounts) {
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let msg = AliceToBob::Amounts(amounts);
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self.amounts.send(channel, msg);
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info!("Sent amounts response");
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}
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/// Message0 gets sent within the network layer using this state0.
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pub fn set_state0(&mut self, state: State0) {
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debug!("Set state 0");
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let _ = self.message0.set_state(state);
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}
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@ -238,7 +376,18 @@ impl Alice {
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channel: ResponseChannel<AliceToBob>,
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msg: xmr_btc::alice::Message1,
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) {
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self.message1.send(channel, msg)
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self.message1.send(channel, msg);
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debug!("Sent Message1");
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}
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/// Send Message2 to Bob in response to receiving his Message2.
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pub fn send_message2(
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&mut self,
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channel: ResponseChannel<AliceToBob>,
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msg: xmr_btc::alice::Message2,
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) {
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self.message2.send(channel, msg);
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debug!("Sent Message2");
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}
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}
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@ -252,17 +401,18 @@ impl Default for Alice {
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message0: Message0::default(),
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message1: Message1::default(),
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message2: Message2::default(),
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message3: Message3::default(),
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identity,
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}
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}
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}
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fn calculate_amounts(btc: ::bitcoin::Amount) -> SwapAmounts {
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const XMR_PER_BTC: u64 = 100; // TODO: Get this from an exchange.
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// TODO: Get this from an exchange.
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// This value corresponds to 100 XMR per BTC
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const PICONERO_PER_SAT: u64 = 1_000_000;
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// TODO: Check that this is correct.
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// XMR uses 12 zerose BTC uses 8.
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let picos = (btc.as_sat() * 10000) * XMR_PER_BTC;
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let picos = btc.as_sat() * PICONERO_PER_SAT;
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let xmr = monero::Amount::from_piconero(picos);
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SwapAmounts { btc, xmr }
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Lucas Soriano
4 years ago
committed by
GitHub